Finding the Third Proportional to 310,686 and 672,150

Step by Step Solution

1. Step 1: Write the proportion equation
   310,686 : 672,150 = 672,150 : x
2. Step 2: Convert to fraction form
   310,686/672,150 = 672,150/x
3. Step 3: Cross multiply
   310,686x = 672,150 × 672,150
4. Step 4: Simplify right side
   310,686x = 451,785,622,500
5. Step 5: Solve for x
   x = 451,785,622,500/310,686
6. Step 6: Final answer
   x = 1,454,155.07